Gadenin日本語Get the appHow the year is shaped
Tarragon's year has four distinct phases and only two of them need much from you. There is a late, slow emergence in spring, a productive stretch through early and midsummer, a decline through late summer and autumn as flavor drops away, and a complete dormancy in winter when the plant is invisible and your main job is keeping it dry.
The dates that matter are not calendar dates but events: your last frost, the point the soil holds above 50F (10C), your first frost, and roughly six weeks before that first frost. Every instruction below hangs off one of those four, so the same plan works wherever you garden.
The one thing that trips people up every year is how late tarragon appears. It is often four to six weeks behind chives and mint. Do not dig, do not replant the spot, and do not give up on a bare crown until well after the last frost has passed.
| Season | What the plant is doing | Your jobs |
|---|---|---|
| Early spring | Dormant crown, no top growth yet | Clear old debris, scratch in a light feed, resist watering |
| Mid to late spring | Shoots break the surface once soil passes 50F (10C) | Divide established clumps, plant out new plants, mark positions |
| Early summer | Fast leafy growth, best flavor of the year | Main harvest and the cut back by a third; take cuttings |
| Midsummer | Regrowth, stems begin to flop, occasional flower buds | Pinch buds, pick regularly, water deeply but rarely |
| Late summer | Growth slows, flavor thins, lower leaves yellow | Last worthwhile cut six weeks before first frost, then stop |
| Autumn | Top growth dies back after frost | Cut dead stems to the base and remove them; improve drainage |
| Winter | Fully dormant, nothing above ground | Keep it dry, raise pots off the ground, do not water |
Spring: the slow start
Begin by clearing anything left lying over the crown. Old mulch and rotted stems hold moisture exactly where you do not want it and carry over rust spores from last year. Scratch a light dressing of general fertilizer into the surface as the shoots appear, and then leave feeding alone for the rest of the season.
This is the only good window for division. Once the shoots are visible but still short, lift and split any clump in its third year or older, discard the woody center, and replant the outer pieces eighteen inches (45 cm) apart with grit worked in. Doing this in autumn instead is the most common way to lose a plant, because divisions have no time to root before the wet cold arrives.
New plants go out after the last frost. Water them in once and then let them settle. Do not pick anything from a newly planted or newly divided crown for at least six weeks.
Summer: harvest and maintenance
Early summer is the peak. Take the main harvest as a single cut, removing about a third of the plant, cutting each stem above a leaf joint. That one job gets you the best-tasting tarragon of the year, stops the lax stems from flopping outward, and pushes the plant into bushier regrowth. Take softwood cuttings from the same material while it is still soft.
Through midsummer, pick regularly and pinch off any flower buds that form. Water deeply only when the top two inches (5 cm) have dried, and do not feed. In a container, one weak liquid feed a month is the maximum.
Make the last cut about six weeks before your first expected frost. After that the plant needs to build up its crown undisturbed, and anything you take is coming out of next year.
Autumn and winter: the part that decides next year
Once frost has blackened the top growth, cut every stem off at the base and take the material away rather than letting it lie. This is the single most effective disease control tarragon gets, since both rust and mildew overwinter in that debris.
Autumn is also the time to fix drainage while you can still see the problem. If water stands where the plant sits, lift the crown, raise the planting area with grit and coarse material, and replant it four to six inches (10 to 15 cm) proud of the surrounding soil. Do not mulch over the crown itself; mulch the soil around it if you must, leaving a clear collar.
In winter, do nothing. Pots go somewhere sheltered from rain, up on feet, and stay unwatered. A dormant tarragon needs cold far less than it needs dry, and the great majority of winter losses are drowning rather than freezing.
Push a labeled cane in beside each crown before the top growth disappears. Tarragon emerges so late that unmarked plants are routinely forked through during winter digging, or dug up in spring by an owner convinced they have died.
The log that makes next year easier
Four dates written down each year turn this general calendar into your own. Record when the first shoots appeared, when you took the main summer cut, when you made the last cut, and when frost finally blackened the plant. After two seasons you know your own emergence date well enough to stop worrying in spring, and you can time the last cut properly instead of guessing.
Add the year each clump was planted or divided, and mark the position of every crown. Between them, those notes answer the two questions that come up every single season: is this plant dead or just late, and is this the year to divide it.